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PRECISE OPTICAL LAYOUT FOR CENTER PRICKING

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Joules:
The outer housing is 3D printed in PLA, but could just as easily be Delrin/Acetal or aluminium/brass, but plastics tend not to mark items.   Yes, 12mm acrylic rod.

nrml:
I missed this thread completely :Doh:. Many thanks to all the contributors. I am thinking of making one with a small footprint. I suspect illumination and the need for magnification will be an issue. A small magnetic base with a LED in the wall for illumination should work nicely. Would a tapered plug of acrylic with the big end domed work for the optics? I keep thinking that if it were that simple, someone would have done it already :scratch:. 

RussellT:
I've been thinking about making one of these since I saw this page.

http://www.gadgetbuilder.com/OpticalPunch.html

He gives some info about magnification and radii.

Hats off to Joules for his design and construction technique. :clap: :thumbup:

Russell

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